Slice 2 bunches carrots (with greens); chop 1 cup of the greens. Toss the carrots with olive oil, salt and pepper. Roast at 425 degrees F, tossing once, until tender, 20 minutes. Puree the carrot greens (or 1 cup chopped basil) with 1/4 cup each olive oil, grated parmesan and mint leaves, 1 garlic clove and 1 tablespoon lemon juice; season with salt. Top the carrots with the pesto and chopped hazelnuts.